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Cash and cash equivalents (Tables) | 12 Months Ended
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Dec. 31, 2017
Text block1 [abstract] |
Schedule of Cash and Cash Equivalents |
|  | 2017 |  |  | 2016 |
Checking and saving accounts |  | $ | 145,283 |  |  | $ | 173,943 |
Time deposits of no more than ninety days |  |  | 30,000 |  |  |  | 57,500 |
Overnight deposits |  |  | 63,157 |  |  |  | 99,933 |
Cash on hand |  |  | 352 |  |  |  | 311 |
|  | $ | 238,792 |  |  | $ | 331,687 |

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- Definition Schedule of cash and cash equivalents. + References No definition available. + Details
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